CN106867486A - A kind of frothy gel well workover method for increasing made with water blockoff connection and its application - Google Patents
A kind of frothy gel well workover method for increasing made with water blockoff connection and its application Download PDFInfo
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- CN106867486A CN106867486A CN201710268823.6A CN201710268823A CN106867486A CN 106867486 A CN106867486 A CN 106867486A CN 201710268823 A CN201710268823 A CN 201710268823A CN 106867486 A CN106867486 A CN 106867486A
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/42—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells
- C09K8/426—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells for plugging
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/58—Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids
- C09K8/588—Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids characterised by the use of specific polymers
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/60—Compositions for stimulating production by acting on the underground formation
- C09K8/84—Compositions based on water or polar solvents
- C09K8/86—Compositions based on water or polar solvents containing organic compounds
- C09K8/88—Compositions based on water or polar solvents containing organic compounds macromolecular compounds
- C09K8/887—Compositions based on water or polar solvents containing organic compounds macromolecular compounds containing cross-linking agents
Abstract
A kind of frothy gel well workover method for increasing made with water blockoff connection and its application, it is related to field of oilfield chemistry, the method can give full play to the function of low density foam gel, in well workover, allow low density foam gel under positive differential pressure spontaneous intrusion near wellbore zone middle and high infiltration layer, form effectively temporarily stifled at reservoir leakage, workover treatment is smoothly completed.After well workover terminates, pressure is removed, make low density foam gel continue to be played a role in the form of water shutoff agent, play effect of selective water plugging.The present invention combines frothy gel water-plugging technique novelly, well workover of breaking the normal procedure recovers the thinking limitation of production capacity with lost circulation prevention, propose the new approaches of " borrowing leakage to increase production ", the frothy gel of low-density is innovatively chosen as well killing fluid, make full use of its selective water plugging function, using well killing fluid " leakage channel " as " the volume increase passage " of oil, cooperate with performance well workover temporarily stifled and two kinds of technical advantages of gel water-plugging, substantially the production capacity after raising High water cut low pressure oil well well workover.
Description
Technical field
The present invention relates to field of oilfield chemistry, in particular to a kind of frothy gel well workover volume increase made with water blockoff connection
Method and its application.
Background technology
At present, many oil fields of China have been enter into mid-later development phase, and many OWs are produced in spite of illness, and upkeep operation is frequent.This
Outward, as strata pressure is significantly decayed, water ratio in oil well is gradually increasing, and causes oil well output to decline, in production process frequently
Water-blocking operation, further increases exploitation difficulty and cost of winning.
In currently used workover fluid, oil-soluble temporarily blocks up type workover fluid size hardly possible and is matched with formation pore, and there is also cannot
Meet the risk of oily de-plugging；Solids free saltwater killing fluid density is larger, it is easier to miss；Spume Well Killing Liquid preparation technology is answered
Miscellaneous, high cost and its stability need to be improved.Importantly, the main mesh of these workover fluids is only to rebuild pressure balance and prevent
Leak-stopping loses, and does not have the function of selective water plugging.Such thinking has some limitations, right in practical operation
In low pressure high-water-cut oil-producing well, typically by well workover and water blockoff separate operation, construction operation cost can be increased, be unfavorable for improving economic effect
Benefit.Therefore, setting up a kind of method for well fixing made with water blockoff connection is worth further investigation.
The content of the invention
The first object of the present invention is to provide a kind of frothy gel well workover method for increasing made with water blockoff connection, the method energy
The function of low density foam gel is enough given full play to, is effectively formed in well workover and temporarily blocked up, workover treatment is smoothly completed, repaiied
After well terminates, and effect of selective water plugging can be reached using low density foam gel, reach the purpose of lasting volume increase.
The second object of the present invention is to provide a kind of high in low pressure with water blockoff connection is made frothy gel well workover method for increasing
Application in aqueous well exploitation.Using the method, workover treatment and water-blocking operation can be carried out continuously, reduce and be constructed into
This, improves the economic well-being of workers and staff of oil well.
What embodiments of the invention were realized in：
A kind of frothy gel well workover method for increasing made with water blockoff connection, including：
By low density foam gel pressurization injection pit shaft, make shaft bottom that the positive differential pressure of 2~5MPa is formed to stratum, in the malleation
The lower frothy gel of difference invades near wellbore zone middle and high infiltration layer, and forms temporarily stifled at leakage in high permeability formation, carries out workover treatment.With
And, pressure is removed, the low density foam gel in discharge pit shaft is returned, recover strata pressure, make to stay in low near wellbore zone
Density foam gel selective water blockoff.
A kind of application of frothy gel well workover method for increasing made with water blockoff connection in the exploitation of low pressure high-water-cut oil-producing well.
The beneficial effect of the embodiment of the present invention is：The invention provides a kind of frothy gel well workover volume increase made with water blockoff connection
Method, the method can give full play to the function of low density foam gel, in well workover, gel rubber material pressurization be pumped into pit shaft
In, so that shaft bottom forms the positive differential pressure of 2~5MPa, under the positive differential pressure, the nearly well of the spontaneous intrusion of low density foam gel to stratum
Area middle and high infiltration layer, forms effectively temporarily stifled at reservoir leakage, prevents from being altered on oil gas, workover treatment is smoothly completed.
After well workover terminates, pressure is removed in time, return the low density foam gel in discharge pit shaft, now, because the low density foam is solidifying
Glue be with gas phase as dispersed phase, Gas-Liquid Dispersion system of the liquid gum plug system as continuous phase.Foam is preferentially entered with water as foreign minister
Water-yielding stratum, and in water-yielding stratum stable existence, water layer is blocked by Jamin effect superposition.On the contrary, in oil reservoir, due to interface energy
With the characteristic for tending to reducing, foam can be destroyed because surfactant largely moves on to oil-water interfaces, therefore foam will not be blocked
Oil reservoir.Therefore low density foam gel can be made to continue to be played a role in the form of water shutoff agent, and effect of selective water plugging is played, reach
The purpose of lasting volume increase.
Present invention also offers a kind of above-mentioned frothy gel well workover method for increasing made with water blockoff connection in low pressure High water cut
Application in oil mining.Apply this method to low pressure high-water-cut oil-producing well exploitation in, can be by workover treatment and water-blocking operation
It is carried out continuously, so as to significantly reduce construction cost, improves the economic well-being of workers and staff of oil well.
Brief description of the drawings
Technical scheme in order to illustrate more clearly the embodiments of the present invention, below will be attached to what is used needed for embodiment
Figure is briefly described, it will be appreciated that the following drawings illustrate only certain embodiments of the present invention, thus be not construed as it is right
The restriction of scope, for those of ordinary skill in the art, on the premise of not paying creative work, can also be according to this
A little accompanying drawings obtain other related accompanying drawings.
A kind of water blockoff of the frothy gel well workover method for increasing of the and water blockoff connection work that Fig. 1 is provided by the embodiment of the present invention is former
Reason schematic diagram；
A kind of simulation of the frothy gel well workover method for increasing of the and water blockoff connection work that Fig. 2 is provided by the embodiment of the present invention 1
Experimental result；
A kind of simulation of the frothy gel well workover method for increasing of the and water blockoff connection work that Fig. 3 is provided by the embodiment of the present invention 2
Experimental result；
A kind of simulation of the frothy gel well workover method for increasing of the and water blockoff connection work that Fig. 4 is provided by the embodiment of the present invention 3
Experimental result；
A kind of simulation of the frothy gel well workover method for increasing of the and water blockoff connection work that Fig. 5 is provided by the embodiment of the present invention 4
Experimental result.
Specific embodiment
To make the purpose, technical scheme and advantage of the embodiment of the present invention clearer, below will be in the embodiment of the present invention
Technical scheme be clearly and completely described.Unreceipted actual conditions person, builds according to normal condition or manufacturer in embodiment
The condition of view is carried out.Agents useful for same or the unreceipted production firm person of instrument, are the conventional product that can be obtained by commercially available purchase
Product.
The frothy gel well workover method for increasing and its application made to a kind of and water blockoff connection of the embodiment of the present invention below are carried out
Illustrate.
A kind of frothy gel well workover method for increasing made with water blockoff connection, including：
Low density foam gel is injected into pit shaft, is pressurizeed so that shaft bottom makes foam to the positive differential pressure of 2~5MPa of stratum formation
Gel invades near wellbore zone middle and high infiltration layer, and forms temporarily stifled at leakage in high permeability formation, carries out workover treatment.The model of positive differential pressure
It is that inventor combines experience and creative work to enclose, and the optimum results for obtaining in the pressure differential range, can coagulate foam
The penetration degree of glue is appropriate, can both ensure to reach good temporarily stifled effect, is avoided that the situation of excessive permeation occurs again.
The raw material of the low density foam gel includes：2~6wt% of polymer, 1~4.5%wt% of crosslinking agent, foaming agent 2
The water of~5wt% and surplus.When above-mentioned low density foam gel is prepared, it is only necessary to the foaming agent and institute after by foaming
After stating polymer, crosslinking agent mixing, and stir in the frothy gel being mixed to get not flowable partially larger than 15%,
Namely the intensity of frothy gel reaches E~F grades of (the blocking agent gel strength ten that intensity evaluation standard is proposed with reference to Sydansk et al.
Deng as shown in table 1)
The gel strength of table 1 estimates code standard
On the other hand, the raw material of the low density foam gel can also be included：2~6wt% of polymer, crosslinking agent 0.1
The water of~3.5wt%, 1~6wt% of foaming agent, 0.5~6wt% of inflating medium and surplus.Inflating medium includes carbonate and acids thing
Matter, the mass ratio of acid and carbonate in inflating medium is 1:1~3.The preparation method of the low density foam gel includes：
The foaming agent stirred after foaming is mixed with polymer, crosslinking agent, gel rubber material is obtained.Gel rubber material is mixed with inflating medium again
Close, you can obtain required low density foam gel.The low density foam gel rubber material is reacted with carbonate and acid and produced
Raw carbon dioxide is filled as the gas in gel.Carbon dioxide is a kind of not combustion-supporting, non-flammable stabilizing gas, itself and day
Right gas mixing will not explode, and use safer.
Inventor has found, according to frothy gel obtained in above two formula and ratio, shaping is fast, good forming effect, and
And medium density, can temporarily be blocked up in oil gas and the aspect of selective water plugging two has given play to good effect.
With gas phase as dispersed phase, gel rubber system is the Gas-Liquid Dispersion system of continuous phase to the low density foam gel.It is with poly-
Compound is that skeleton forms gel with crosslinking agent, and gel rubber system has elasticity well and viscosity is moderate, upper based on gel
Self-generating foam well killing fluid is stated, is conducive to setting up pit shaft circulation in kill-job operation.
The density of the low density foam gel is 0.78~1.00g/cm3, it is adaptable to low pressure oil well.More common gel is blocked up
Agent, there is the characteristics of low-density, low leak-off and selective water plugging, and more conventional Spume Well Killing Liquid, its performance is more stable.Imposing 2~
In the case of the positive differential pressure of 5MPa, the low density foam gel will spontaneous intrusion near wellbore zone middle and high infiltration layer, in reservoir leakage
Place forms effectively temporarily stifled, at the same prevent oil gas and water on alter, there is provided the construction environment of safety so that workover treatment be able to it is suitable
Profit is completed.
Polymer include polyacrylamide, xanthans, guanidine glue, hydroxyethyl cellulose and acrylamide copolymer at least
It is a kind of.Polymer of the present invention, includes many active groups on its strand, can be crosslinked with crosslinking agent,
Form network structure.This structure provides space to the filling of gas, and beneficial to being formed, density is low, good stability foam kill-job
Liquid.
In the present invention, crosslinking agent includes chromic acetate, formaldehyde, aluminium citrate, resorcinol, polyethyleneimine and adjacent benzene two
At least one in phenol.Inventor is based on experience and has paid the crosslinking agent (example that creative work finds organic metal type
Such as chromic acetate, aluminium citrate) and non-metal type crosslinking agent (such as formaldehyde, resorcinol, polyethyleneimine, catechol
Deng), although the slightly difference on mechanism of crosslinking, can act on well and frothy gel system of the invention.
Further, the crosslinking agent of organic metal type is used cooperatively with the crosslinking agent of non-metal type, collaboration can be reached
The effect of synergy, can not only shorten the time of crosslinking, while the effect of crosslinking can be improved.Preferably, organic metal type and
The mass ratio of the crosslinking agent of non-organic metal mold is 1:5~20.With the crosslinking agent that the ratio is mixed to get, the effect of crosslinking is more
It is good.
Foaming agent is a kind of surfactant, including dodecyl sodium sulfate, glycine betaine, neopelex and alkane
At least one in base glucosides.The molecular structure of foaming agent is by nonpolar oleophylic (hydrophobic) group and hydrophilic (oleophobic) of polarity
Group is constituted, and form existing hydrophily has so-called " amphiphilic structure " molecule of lipophilic again.Foaming agent is added in water, hydrophilic group
Insertion water phase and lipophilic group insertion oil phase are erect in atmosphere, are formed in aligning on boundary layer or surface, so as to
Interfacial tension is reduced on gas-water interface, promotes air that minute bubbles are formed in slurry, to expand sorting section, form foam
Layer.Foaming agent fully after foaming mixes with polymer, crosslinking agent, forms gel foam, further increases the stabilization of foam
Property.
Carbonate includes at least one in ammonium hydrogen carbonate, potassium carbonate, sodium carbonate, sodium acid carbonate, ammonium carbonate, calcium carbonate.
Meanwhile, acid is included in citric acid, acetic acid, formic acid, acetic acid, boric acid, gluconic acid, salicylic acid, tartaric acid, malic acid
It is at least one.After carbonate and acid mixing, carbon dioxide can be produced.Carbon dioxide is dispersed in gel foam, is entered
One step increases the gas capacity of gel foam, reduces the global density of well killing fluid, loses and has good stability to obtain low-density, low drain
Well killing fluid.
The making of above-mentioned low density foam gel and its convenience, it is not necessary to complicated production equipment, it is only necessary to simply stir
Mixing is mixed, can be matched somebody with somebody working site is instant.When configuring at the scene, each raw material need to only be entered according to above-mentioned preparation method
Row mixing, until the intensity of the low density foam gel for being formed reaches E~F grades, you can and it is pumped into pit shaft, carries out kill-job
Operation.
A kind of frothy gel well workover method for increasing made with water blockoff connection provided by the present invention also includes：Make well workover is completed
After industry, pressure is removed, return the low density foam gel in discharge pit shaft, recover strata pressure, the low density foam of leakage coagulates
Glue will continue to stay near wellbore zone, play effect of selective water plugging.
As shown in figure 1, due to the low density foam gel be with gas phase as dispersed phase, liquid gum plug system is as continuous phase
Gas-Liquid Dispersion system.Foam preferentially enters water-yielding stratum, and in water-yielding stratum stable existence, folded by Jamin effect with water as foreign minister
Calais blocks water layer.On the contrary, in oil reservoir, because interface can have the characteristic for tending to reducing, foam can be because surfactant
Largely move on to oil-water interfaces and destroy, therefore foam will not reservoir plugging.Therefore low density foam gel can be made to continue with water shutoff agent
Form plays a role, and plays effect of selective water plugging, reaches the purpose of lasting volume increase.
Feature of the invention and performance are described in further detail with reference to embodiments.
In embodiment provided by the present invention, experimental technique is according to oil and gas professional standard SY/T5834-2007
The published leakproof experimental evaluation correlation technique of " low solid phase well killing fluid Performance Evaluating Indexes and assay method " and document carries out pressure
Well well workover lab simulation.
Tested using core physical simulation in experiment, investigate the leak-off situation and effect of increasing production of well killing fluid.Selection 50~
The rock core of 300mD permeabilities is tested for experimental subjects.Before well workover, moisture content reaches 90% when carrying out water drive oil to rock core
More than, simulation oil well produces the High water cut phenomenon in later stage.
Embodiment 1
The present embodiment provides a kind of frothy gel well workover method for increasing made with water blockoff connection, and its concrete operations is as follows, and it makes
The basic parameter of rock core is as shown in table 1.
The rock core basic parameter that the embodiment 1 of table 1. is used
S1. determine that the consumption of low density foam gel is 1600mL according to experimental provision volume.
S2. the foaming agent (APG and dodecyl sodium sulfate) of 2wt% is sequentially added in deionized water, is fully stirred
Mix and be allowed to that foaming is abundant, the crosslinking agent of the polymer (polyacrylamide) and 1.6wt% that are subsequently added 3wt% (chromic acetate and gathers
Aziridine), stirred with glass bar, it is crosslinked at room temperature, obtain low-density gel foam.When frothy gel intensity
When reaching E~F grades, it is added in pit shaft.
S3. well workover simulated experiment is carried out at room temperature, to nitrogen is filled with pit shaft, sets up the positive differential pressure of 2MPa.This is low close
Degree frothy gel forms gel filter cake in rock core end face, and filter cake has certain elasticity and integrality, effectively can temporarily block up.In 60min
Pressure drop is only 0.02MPa, and filter loss is always 0, illustrates that the low density foam gel well killing fluid has the characteristic and of low leak-off
Fixed anti-pressure ability.After the completion of workover treatment, pressure is removed, return the low density foam gel in discharge pit shaft, make to stay in nearly well
Low density foam gel in area continues to play plugging function under atmospheric pressure state, and concrete outcome is as shown in Figure 2.
As seen from Figure 2, before well workover is carried out, moisture content is carried out during water drive oil to rock core up to 93.3%, simulation oil
Well produces the High water cut phenomenon in later stage.After well workover, moisture content drops to 89.6%, illustrates to be played necessarily using the method for well fixing
Water plugging effect.
Meanwhile, the oil content in liquid that goes out before well workover reaches 6.7%.And the oil content in liquid that goes out after well workover reaches 10.4%,
Oil content substantially rises.The low density foam gel is illustrated, with protection against leakage reservoir and the resultant effect for improving production capacity.
Embodiment 2
The present embodiment provides a kind of frothy gel well workover method for increasing made with water blockoff connection, and its concrete operations is as follows, and it makes
The basic parameter of rock core is as shown in table 2.
The rock core basic parameter that the embodiment 2 of table 2. is used
S1. determine that the consumption of low density foam gel is 1600mL according to experimental provision volume.
S2. the foaming agent (APG and glycine betaine) of 3wt% is sequentially added in deionized water, is sufficiently stirred for being allowed to send out
Bubble is abundant, be subsequently added 3.5wt% polymer (polyacrylamide and xanthans) and 2.1wt% crosslinking agent (chromic acetate with
Polyethyleneimine), stirred with glass bar, it is crosslinked at room temperature, obtain low-density gel foam.When frothy gel is strong
When degree reaches E~F grades, it is added in pit shaft.
S3. well workover simulated experiment is carried out at room temperature, to nitrogen is filled with pit shaft, sets up the positive differential pressure of 2MPa.This is low close
Degree frothy gel forms gel filter cake in rock core end face, and filter cake has certain elasticity and integrality, effectively can temporarily block up.In 60min
Pressure drop is only 0.05MPa, and filter loss is always 0, illustrates that the low density foam gel well killing fluid has the characteristic and of low leak-off
Fixed anti-pressure ability.After the completion of workover treatment, pressure is removed, return the low density foam gel in discharge pit shaft, make to stay in nearly well
Low density foam gel in area continues to play plugging function under atmospheric pressure state, and concrete outcome is as shown in Figure 3.
As seen from Figure 3, before well workover is carried out, moisture content is carried out during water drive oil to rock core up to 91.7%, simulation oil
Well produces the High water cut phenomenon in later stage.After well workover, moisture content drops to 85.7%, illustrates to be played necessarily using the method for well fixing
Water plugging effect.
Meanwhile, the oil content in liquid that goes out before well workover reaches 8.3%.And the oil content in liquid that goes out after well workover reaches 14.3% and contains
Oil mass substantially rises.The low density foam gel is illustrated, with protection against leakage reservoir and the resultant effect for improving production capacity.
Embodiment 3
The present embodiment provides a kind of frothy gel well workover method for increasing made with water blockoff connection, and its concrete operations is as follows, and it makes
The basic parameter of rock core is as shown in table 3.
The rock core basic parameter that the embodiment 3 of table 3. is used
S1. determine that the consumption of low density foam gel is 1600mL according to experimental provision volume.
S2. the foaming agent (APG and neopelex) of 4wt% is sequentially added in deionized water, fully
Stirring is allowed to that foaming is abundant, be subsequently added 3wt% polymer (polyacrylamide) and 2.2wt% crosslinking agent (chromic acetate with
Polyethyleneimine), stirred with glass bar, it is crosslinked at room temperature, obtain the low density foam gel rubber material.Work as foam
When gel strength reaches E~F grades, it is added in pit shaft.
S3. well workover simulated experiment is carried out at room temperature, to nitrogen is filled with pit shaft, sets up the positive differential pressure of 2MPa.This is low close
Degree frothy gel forms gel filter cake in rock core end face, and filter cake has certain elasticity and integrality, effectively can temporarily block up.In 60min
Pressure drop is only 0.03MPa, and filter loss is always 0, illustrates that the low density foam gel well killing fluid has the characteristic and of low leak-off
Fixed anti-pressure ability.After the completion of workover treatment, pressure is removed, return the low density foam gel in discharge pit shaft, make to stay in nearly well
Low density foam gel in area continues to play plugging function under atmospheric pressure state, and concrete outcome is as shown in Figure 4.
As seen from Figure 4, before well workover is carried out, moisture content is carried out during water drive oil to rock core up to 94.1%, simulation oil
Well produces the High water cut phenomenon in later stage.After well workover, moisture content drops to 90.5%, illustrates to be played necessarily using the method for well fixing
Water plugging effect.
Meanwhile, the oil content in liquid that goes out before well workover reaches 5.9%.And the oil content in liquid that goes out after well workover reaches 9.5%, contain
Oil mass substantially rises.The low density foam gel is illustrated, with protection against leakage reservoir and the resultant effect for improving production capacity.
Embodiment 4
The present embodiment provides a kind of frothy gel well workover method for increasing made with water blockoff connection, and its concrete operations is as follows, and it makes
The basic parameter of rock core is as shown in table 3.
The rock core basic parameter that the embodiment 4 of table 4. is used
S1. determine that the consumption of low density foam gel is 1600mL according to experimental provision volume.
S2. the foaming agent (APG and glycine betaine) of 3.5wt% is sequentially added in deionized water, is sufficiently stirred for being allowed to
Foaming is abundant, be subsequently added 3.2wt% polymer (polyacrylamide and guanidine glue) and 1.6wt% crosslinking agent (chromic acetate and
Polyethyleneimine), stirred with glass bar, it is crosslinked at room temperature, obtain the low density foam gel rubber material.Work as foam
When gel strength reaches E~F grades, it is added in pit shaft.
S3. well workover simulated experiment is carried out at room temperature, to nitrogen is filled with pit shaft, sets up the positive differential pressure of 2MPa.This is low close
Degree frothy gel forms gel filter cake in rock core end face, and filter cake has certain elasticity and integrality, effectively can temporarily block up.In 60min
Pressure drop is only 0.03MPa, and filter loss is always 0, illustrates that the low density foam gel well killing fluid has the characteristic and of low leak-off
Fixed anti-pressure ability.After the completion of workover treatment, pressure is removed, return the low density foam gel in discharge pit shaft, make to stay in nearly well
Low density foam gel in area continues to play plugging function under atmospheric pressure state, and concrete outcome is as shown in Figure 5.
As seen from Figure 5, before well workover is carried out, moisture content is carried out during water drive oil to rock core up to 94.1%, simulation oil
Well produces the High water cut phenomenon in later stage.After well workover, moisture content drops to 88.6%, illustrates to be played necessarily using the method for well fixing
Water plugging effect.
Meanwhile, the oil content in liquid that goes out before well workover reaches 5.9%.And the oil content in liquid that goes out after well workover reaches 11.3%,
Oil content substantially rises.The low density foam gel is illustrated, with protection against leakage reservoir and the resultant effect for improving production capacity.
Embodiment 5
The present embodiment provides a kind of frothy gel well workover method for increasing made with water blockoff connection, and its concrete operations is as follows, and it makes
Rock core is same as Example 1.
S1. determine that the consumption of low density foam gel is 1600mL according to experimental provision volume.
S2. the foaming agent (APG and glycine betaine) of 3.5wt% is sequentially added in deionized water, is sufficiently stirred for being allowed to
Foaming is abundant, be subsequently added 3.2wt% polymer (polyacrylamide and guanidine glue) and 1.6wt% crosslinking agent (chromic acetate and
Polyethyleneimine), stirred with glass bar, it is crosslinked at room temperature, obtain gel rubber material.
S3. above-mentioned gel rubber material is mixed with oxalic acid dihydrate, ammonium hydrogen carbonate, is stirred with glass bar, obtain this low close
Degree foam gel material.When frothy gel intensity reaches E~F grades, it is added in pit shaft.
S4. carry out well workover simulated experiment at room temperature, to be filled with pit shaft nitrogen or according to consumption design inflating medium one
Determine to generate carbon dioxide at temperature, set up the positive differential pressure of 3MPa.The low density foam gel forms gel filter in rock core end face
Cake, filter cake has certain elasticity and integrality, effectively can temporarily block up.60min internal drops are only 0.05MPa, and filter loss is always 0, is said
The bright low density foam gel well killing fluid has the characteristic and certain anti-pressure ability of low leak-off.After the completion of workover treatment, remove
Pressure, returns the low density foam gel in discharge pit shaft, makes to stay in the low density foam gel near wellbore zone in atmospheric pressure state
It is lower to continue to play plugging function.
The frothy gel well workover method for increasing that a kind of and water blockoff connection that the present embodiment is provided is made, it is aqueous before and after well workover
Rate declines up to 5.3%, can play more obvious plugging function.
Embodiment 6
The present embodiment provides a kind of frothy gel well workover method for increasing made with water blockoff connection, and its concrete operations is as follows, and it makes
Rock core is same as Example 1.
S1. determine that the consumption of low density foam gel is 1600mL according to experimental provision volume.
S2. the foaming agent (APG and neopelex) of 3wt% is sequentially added in deionized water, fully
Stirring is allowed to foaming fully, is subsequently added the polymer (acrylamide copolymer) of 6wt% and the crosslinking agent (chromic acetate of 3wt%
And catechol), stirred with glass bar, it is crosslinked at room temperature, obtain gel rubber material.
S3. above-mentioned gel rubber material is mixed with citric acid, ammonium hydrogen carbonate, is stirred with glass bar, obtain the low-density
Foam gel material.When frothy gel intensity reaches E~F grades, it is added in pit shaft.
S4. carry out well workover simulated experiment at room temperature, to be filled with pit shaft nitrogen or according to consumption design inflating medium one
Determine to generate carbon dioxide at temperature, set up the positive differential pressure of 3MPa.The low density foam gel forms gel filter in rock core end face
Cake, filter cake has certain elasticity and integrality, effectively can temporarily block up.60min internal drops are only 0.02MPa, and filter loss is always 0, is said
The bright low density foam gel well killing fluid has the characteristic and certain anti-pressure ability of low leak-off.After the completion of workover treatment, remove
Pressure, returns the low density foam gel in discharge pit shaft, makes to stay in the low density foam gel near wellbore zone in atmospheric pressure state
It is lower to continue to play plugging function.
The frothy gel well workover method for increasing that a kind of and water blockoff connection that the present embodiment is provided is made, it is aqueous before and after well workover
Rate declines up to 4.2%, can play more obvious plugging function.
Embodiment 7
The present embodiment provides a kind of frothy gel well workover method for increasing made with water blockoff connection, and its concrete operations is as follows, and it makes
Rock core is same as Example 1.
S1. determine that the consumption of low density foam gel is 1600mL according to experimental provision volume.
S2. the foaming agent (neopelex and glycine betaine) of 6wt% is sequentially added in deionized water, is fully stirred
Mix and be allowed to foaming fully, be subsequently added the polymer (guanidine glue and hydroxyethyl cellulose) of 2wt% and the crosslinking agent (lemon of 1.2wt%
Lemon acid aluminium and polyethyleneimine), stirred with glass bar, it is crosslinked at room temperature, obtain gel rubber material.
S3. above-mentioned gel rubber material is mixed with citric acid, sodium acid carbonate, is stirred with glass bar, obtain the low-density
Foam gel material.When frothy gel intensity reaches E~F grades, it is added in pit shaft.
S4. carry out well workover simulated experiment at room temperature, to be filled with pit shaft nitrogen or according to consumption design inflating medium one
Determine to generate carbon dioxide at temperature, set up the positive differential pressure of 4MPa.The low density foam gel forms gel filter in rock core end face
Cake, filter cake has certain elasticity and integrality, effectively can temporarily block up.60min internal drops are only 0.03MPa, and filter loss is always 0, is said
The bright low density foam gel well killing fluid has the characteristic and certain anti-pressure ability of low leak-off.After the completion of workover treatment, remove
Pressure, returns the low density foam gel in discharge pit shaft, makes to stay in the low density foam gel near wellbore zone in atmospheric pressure state
It is lower to continue to play plugging function.
The frothy gel well workover method for increasing that a kind of and water blockoff connection that the present embodiment is provided is made, it is aqueous before and after well workover
Rate declines up to 5.3%, can play more obvious plugging function.
Embodiment 8
The present embodiment provides a kind of frothy gel well workover method for increasing made with water blockoff connection, and its concrete operations is as follows, and it makes
Rock core is same as Example 1.
S1. determine that the consumption of low density foam gel is 1600mL according to experimental provision volume.
S2. the foaming agent (dodecyl sodium sulfate and APG) of 5wt% is sequentially added in deionized water, is fully stirred
Mix and be allowed to foaming fully, be subsequently added the polymer (acrylamide copolymer) of 4wt% and the crosslinking agent (acetic acid of 0.2wt%
Chromium), stirred with glass bar, it is crosslinked at room temperature, obtain gel rubber material.
S3. above-mentioned gel rubber material is mixed with tartaric acid, calcium carbonate, is stirred with glass bar, obtain low-density bubble
Foam gel rubber material.When frothy gel intensity reaches E~F grades, it is added in pit shaft.
S4. carry out well workover simulated experiment at room temperature, to be filled with pit shaft nitrogen or according to consumption design inflating medium one
Determine to generate carbon dioxide at temperature, set up the positive differential pressure of 2MPa.The low density foam gel forms gel filter in rock core end face
Cake, filter cake has certain elasticity and integrality, effectively can temporarily block up.60min internal drops are only 0.02MPa, and filter loss is always 0, is said
The bright low density foam gel well killing fluid has the characteristic and certain anti-pressure ability of low leak-off.After the completion of workover treatment, remove
Pressure, returns the low density foam gel in discharge pit shaft, makes to stay in the low density foam gel near wellbore zone in atmospheric pressure state
It is lower to continue to play plugging function.
The frothy gel well workover method for increasing that a kind of and water blockoff connection that the present embodiment is provided is made, it is aqueous before and after well workover
Rate declines up to 3.4%, can play more obvious plugging function.
In sum, the invention provides a kind of frothy gel well workover method for increasing made with water blockoff connection, the method can
Give full play to the function of low density foam gel, in well workover, pressurize so that shaft bottom to stratum formed 2~5MPa positive differential pressure,
The spontaneous intrusion near wellbore zone middle and high infiltration layer of the low density foam gel, forms effectively temporarily stifled at reservoir leakage, prevents on oil gas
Alter, workover treatment is smoothly completed.After well workover terminates, pressure is removed in time, return the low density foam in discharge pit shaft
Gel, now, due to the low density foam gel be with gas phase as dispersed phase, Gas-Liquid Dispersion of the liquid gum plug system as continuous phase
System.Foam preferentially enters water-yielding stratum, and in water-yielding stratum stable existence, blocked by Jamin effect superposition with water as foreign minister
Water layer.On the contrary, in oil reservoir, because interface can have the characteristic for tending to reducing, foam can be because surfactant be largely moved on to
Oil-water interfaces and destroy, therefore foam will not reservoir plugging.Therefore low density foam gel can be made to continue to be played in the form of water shutoff agent
Effect, plays effect of selective water plugging, reaches the purpose of lasting volume increase.It is low close present invention also offers a kind of above-mentioned use
Spend application of the method for frothy gel well workover water blockoff in the exploitation of low pressure high-water-cut oil-producing well.Apply this method to low pressure High water cut
In oil mining, workover treatment and water-blocking operation can be carried out continuously, so as to significantly reduce construction cost, improve oil
The economic well-being of workers and staff of well.
The preferred embodiments of the present invention are the foregoing is only, is not intended to limit the invention, for the skill of this area
For art personnel, the present invention can have various modifications and variations.It is all within the spirit and principles in the present invention, made any repair
Change, equivalent, improvement etc., should be included within the scope of the present invention.
Claims (10)
1. it is a kind of to join the frothy gel well workover method for increasing made with water blockoff, it is characterised in that including：
By low density foam gel pressurization injection pit shaft, make shaft bottom that the positive differential pressure of 2~5MPa is formed to stratum, in the positive differential pressure
Under the frothy gel invade near wellbore zone middle and high infiltration layer, and form temporarily stifled at leakage in the high permeability formation, carry out well workover
Operation；And, pressure is removed, the low density foam gel excluded in pit shaft is returned, recover strata pressure, make to stay in nearly well
The low density foam gel selective water blockoff in area.
2. the method for use low density foam gel well workover water blockoff according to claim 1, it is characterised in that described low close
The density for spending frothy gel is 0.78~1.00g/cm3。
3. the method for use low density foam gel well workover water blockoff according to claim 1, it is characterised in that described low close
The raw material for spending frothy gel includes：2~6wt% of polymer, 1~4.5wt% of crosslinking agent, 2~5wt% of foaming agent and surplus
Water.
4. the method for use low density foam gel well workover water blockoff according to claim 1, it is characterised in that described low close
The raw material for spending frothy gel includes：2~6wt% of polymer, 0.1~3.5wt% of crosslinking agent, 1~6wt% of foaming agent, inflating medium
The water of 0.5~6wt% and surplus；The inflating medium includes carbonate and acid, the acids thing in the inflating medium
The mass ratio of matter and the carbonate is 1:1~3.
5. the method for use low density foam gel well workover water blockoff according to claim 3, it is characterised in that prepare described
Low density foam gel be by foaming after the foaming agent mix with the polymer, the crosslinking agent after, and stir extremely
It is not flowable in the frothy gel being mixed to get to be partially larger than 15%.
6. the method for use low density foam gel well workover water blockoff according to claim 3, it is characterised in that the polymerization
Thing includes at least one in polyacrylamide, xanthans, guanidine glue, hydroxyethyl cellulose and acrylamide copolymer.
7. the method for use low density foam gel well workover water blockoff according to claim 3, it is characterised in that the crosslinking
Agent includes at least one in chromic acetate, formaldehyde, aluminium citrate, resorcinol, polyethyleneimine and catechol.
8. the method for use low density foam gel well workover water blockoff according to claim 3, it is characterised in that the foaming
Agent includes at least one in dodecyl sodium sulfate, glycine betaine, neopelex and APG.
9. the method for use low density foam gel well workover water blockoff according to claim 4, it is characterised in that the carbonic acid
Salt includes at least one in ammonium hydrogen carbonate, potassium carbonate, sodium carbonate, sodium acid carbonate, ammonium carbonate and calcium carbonate；The acid
Including at least one in citric acid, acetic acid, formic acid, acetic acid, boric acid, gluconic acid, salicylic acid, tartaric acid, malic acid.
10. a kind of as described in any one of claim 1~9 high in low pressure with water blockoff connection is made frothy gel well workover method for increasing
Application in aqueous well exploitation.
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| CN108084987A (en) * | 2017-12-25 | 2018-05-29 | 中国石油集团川庆钻探工程有限公司长庆井下技术作业公司 | A kind of natural gas well turnaround fracture microvesicle temporarily blocks up liquid filler and its application |
| CN108410439A (en) * | 2018-04-25 | 2018-08-17 | 南阳忠兴石油工程技术服务有限公司 | A kind of method of gel foam and microemulsions in situ combination application oil well production increasing |
| CN110041903A (en) * | 2019-04-25 | 2019-07-23 | 中国石油集团川庆钻探工程有限公司长庆井下技术作业公司 | A kind of low pressure leakage gas well blocking agent and its preparation method and application method |
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| CN113004878A (en) * | 2021-03-23 | 2021-06-22 | 四川省贝特石油技术有限公司 | Leakage-proof leakage-stopping type micro-foam drilling and repairing liquid as well as preparation method and application thereof |
| CN114958323A (en) * | 2022-05-26 | 2022-08-30 | 长江大学 | Self-degradation gel for reservoir plugging and preparation method thereof |
| CN114958323B (en) * | 2022-05-26 | 2023-06-09 | 长江大学 | Self-degrading gel for reservoir plugging and preparation method thereof |
| CN115058236A (en) * | 2022-07-08 | 2022-09-16 | 中海石油(中国)有限公司 | Microbubble self-crosslinking self-adaptive gel deep profile control and flooding system with adjustable gas generation rate and application thereof |
| CN115058236B (en) * | 2022-07-08 | 2024-01-09 | 中海石油(中国)有限公司 | Microbubble self-crosslinking self-adaptive gel deep profile control and flooding system with adjustable gas generating rate and application thereof |
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Application publication date: 20170620 |